compound helicopter


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compound helicopter

A helicopter with an auxiliary propulsion system, which provides thrust in excess of that the rotor(s) alone could produce, thereby permitting increased forward speeds. Wings may, or may not, be provided to reduce the lift required from the rotor system.
References in periodicals archive ?
2-tonne Airbus Helicopters X3 compound helicopter, which is based on the EC155, but has short wings, mounting tractor propellers.
One will be a compound helicopter named LifeRCraft (Low Impact Fast & Efficient RotorCraft).
6-tonne Sikorsky X2 compound helicopter, which has contra-rotating rotors and a pusher propeller.
25-tonne, 425 km/hr compound helicopter with co-axial rotors, a fore-plane and two ducted propulsive fans.
The aircraft--which is based on Sikorsky's X-2 aircraft, a compound helicopter with coaxial rotors--will have its critical design review later this year, he added, with final assembly beginning next year.
The X3, a compound helicopter with a five-bladed top rotor and two short wings fitted with propellers, has flown at a top speed of 232 knots.
Leaps in capabilities--namely speed, agility and endurance--could come in the form of compound helicopters, Bogosian said.
Piasecki said the Office of Naval Research had shown interest in the compound helicopter as an option for a Navy airborne mine-hunting platform.
It appears, however, that the Navy now is not convinced that it needs a compound helicopter for the mine-hunting mission, said an official from the office of the defense secretary.
The OSD official stressed that even though the military services abandoned the compound helicopter decades ago, it is worth considering its reintroduction, because the Defense Department needs to upgrade aging aircraft and does not have enough money to replace every outdated helicopter with a brand-new one.
Piasecki is hoping to interest the Army special operations forces in the compound helicopter, as an option to upgrade the MH-60 Black Hawk and the MH-47 Chinook.
AVX and the Boeing-Sikorsky team are offering compound helicopters with coaxial rotors.